Editing Stealth technology (section)

===Materials===

====Non-metallic airframe====
[[Dielectric]] [[composite material]]s are more transparent to radar, whereas electrically conductive materials such as metals and [[carbon fiber]]s reflect electromagnetic energy incident on the material's surface. Composites may also contain [[Ferrite (magnet)|ferrites]] to optimize the dielectric and magnetic properties of a material for its application.

====Radar-absorbent material====
{{Main|Radiation-absorbent material}}
[[File:B-2 Stealth Bomber Skin, 2009 - Museum of Science and Industry (Chicago) - DSC06496.JPG|thumb|Skin of a [[Northrop Grumman B-2 Spirit|B-2 bomber]].]]
Radiation-absorbent material (RAM), often as paints, are used especially on the edges of metal surfaces. While the material and thickness of RAM coatings can vary, the way they work is the same: absorb radiated energy from a ground- or air-based radar station into the coating and convert it to heat rather than reflect it back.<ref>{{cite journal |url=http://www.researchinventy.com/papers/v3i12/D0312015019.pdf |title=Stealth Technology And Counter Stealth Radars: A Review |first1=Swayam |last1=Arora |first2=Ramanpreet |last2=KaurResearch |journal=Inventy: International Journal of Engineering and Science |volume=3 |issue=12 |date=December 2013 |pages=15–19 |eissn=2278-4721 |issn=2319-6483}}</ref> Current technologies include dielectric composites and metal fibers containing ferrite isotopes. Ceramic composite coating is a new type of material systems which can sustain at higher temperatures with better sand erosion resistance and thermal resistance.<ref>{{cite web |url=https://news.ncsu.edu/2021/05/tougher-skin-for-stealth-aircraft/ |title=How a Tougher Skin Could Change the Shape of Stealth Aircraft |date=18 May 2021}}</ref> Paint comprises depositing pyramid-like colonies on the reflecting superficies with the gaps filled with ferrite-based RAM. The pyramidal structure deflects the incident radar energy in the maze of RAM. One commonly used material is called ''iron ball paint''.<ref>{{cite web |url=http://www.livescience.com/32943-how-stealth-planes-evade-enemy.html |title=How Do Stealth Planes Evade the Enemy? |last=Wolchover |first=Natalie |date=21 January 2011 |website=Live Science |place=Bath, England |access-date=1 July 2019}}</ref> It contains microscopic iron spheres that resonate in tune with incoming radio waves and dissipate most of their energy as heat, leaving little to reflect back to detectors. FSS are planar periodic structures that behave like filters to electromagnetic energy. The considered frequency-selective surfaces are composed of conducting patch elements pasted on the ferrite layer. FSS are used for filtration and microwave absorption.